Telephone-switch



(No Model.) 2 Sheets-Sheet 1.

A. GJDAV-IS. TELEPHONE SWITCH.

No. 498,243. Patented May 30, 1893.

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' UNITED STATES PATENT OFFICE.

AUGUSTUS G. DAVIS, OF BALTIMORE, MARYLAND.

TELEPHONE-SWITCH.

SPECIFICATION forming part Of Letters Patent NO. 498,243, dated May 30, 1893.

Application filed November 25, 1892'. $eria1No. 452,974- (No model.)

To all whom it may concern.- =Be it known that I, AUGUSTUS G. DAVIS, a citizen of the United States, residing atBaltimore, in the State of Maryla'nd,have invented certain new and useful Improvements in Telephone-Switches, of which the following is a specification.

The object of this invention is to provide a depre'ssible switch-operating part in a telephone, which part is manually depressed and as long as so held closes the main-line circuit through the receiver of the telephone, and when relieved of manual pressure is automatically returned to its normal position whereby such circuit is broken.

The invention is illustrated in the accompanying drawings, in which- Figure 1 shows a side view of a telephone provided with one form of my improvement and illustrates the application of the invention. Fig. 2 shows asectional view of the telephone-box with an edge view of the switchparts, and aside view of the elbow-rest. Fig. 3 shows an inside view of the side of the telephone-box on which the switch-parts are mounted. Fig. 4. showsa bottom view of the telephone-box with the rest-arm turned in. Fig. 5 shows a similar view to Fig. 2 of a different form of my improvement. Fig. 6 shows a similar View to Fig. 3 of this latter form.

For the better carrying out of my invention I locate the transmitter, A, above the telephone-box, B, in which the dynamo, C, and switch-devices are contained, the advantage of which Will appear hereinafter. Within the said box, B, and attached on one side of the same is a spring contact-strip or finger, a, which forms the terminal of a conductor connected with one pole of the dynamo, 0. Opposed to this spring-finger, a, is a pair of similar spring contact strips or fingers, b, which form terminals of conductors in the main line circuit through the telephone receiver, D, which is of the usual construction.

In the form shown in Figs. 2 and 3, aswitchlever, E, has one end pivoted at the front of this side of the box and at this pivotal point is connected with a conductor leading from the other pole of the dynamo. This switchlever is arranged to vibrate between the contact-finger, a, and the pair of fingers, b, and

when in contact with the said finger, a, the circuit is made through the dynamo, and it is out of contact with the two fingers, b, Whereby the main-line circuit through the receiver is broken.

A vertically sliding rod, G, is jointed to the free end of the lever, E, and projects from the bottom of the box, B 5 this projecting end of the rod is round and a horizontal arm, H,

is swiveled on it, and may project out at one A side of the box, or be turned in under the bottom of the said box for convenience in shipping, as shown in Fig. 4.. A rest-piece, I, of suitable form for a persons elbow, is mounted on said horizontal arm. A spring, J, holds the arm and connecting-rod, G, up and thereby keeps the switch-lever, E, in contact with the terminal-finger, a, which is above it, and the receiver is thus cut out of the main-line circuit, while the dynamo circuit is closed; in contradistinction to the usual switch in which the spring tends to cut-out the dynamo and close thecircuit through the receiver, and the depression of the switch-piecereverses this condition. In its normal position the restblock, I, is above the bottom of the box, B, and to turn it in under the same, it must first be depressed. Hence the spring, J, will also serve to hold this block close against the bottom of the box when the said block is turned to the position shown in Fig. 4.

It will be observed that the transmitter being above the box, and the horizontal arm, H, below the same, the said arm forms aconvenient rest for the elbow whilethe receiver is held to the ear in the hand of the operators arm which thus finds a resting place, and at the same time the mouth is directly in front of the transmitter. Now when the elbow is rested upon the projecting arm, H, the latter is depressed and through the connecting rod, G, pulls down the switch-lever, E, into contact with the terminals, b, thus closing the main-line circuit through the receiver, and hence as long as the operator keeps his elbowresting on the arm, this circuit is maintained, while he is at the same time provided a rest for his arm which is holding the receiver. Upon removing his elbow from the rest-arm,-when through using the telephone,the spring, J, returns the parts to their normal positions and thus breaks the circuit through the receiver.

The switch is operated entirely independent of the receiver and the latter when not in use may be placed wherever desired without regard to the switch.

In the construction shown in Figs. 5 and 6, the terminal, a, of the dynamo conductor laps the terminals,b, of the main-line circuit, and a lever, E, is pivoted within the box to an arm, E which occupies an opening or notch inthe side of the box and is secured to the box by a flange-plate, e, fitting against the outside of the box. This lever, E, has an upward-extending arm, E within the box and said arm has a lateral end-portion, E which stands between the terminals, 1), and the terminaha. A spring, J, connects alug, f, on thelever'with alug, f, on the flangeplate, 6, and holds the said lateral end-por tion,-E ,in contact with theterminal, aflthus closingthe dynamo-circuit and cuttingout the receiver. The lever, E,projects laterally outof the boxandis jointed by a knuckle= l joint, gt The outer member, Eflof the lever carries an elbow-rest-piece,l, and when not in use this rest-piece maybe folded up against theside of the box as indicated in dotted lines, by turning the outer member of the lever on the knuckle joint, g. It'will beapparent that the manner of use with this latter form of switch is the same asbefore explained of' the first-described form.

It is" obvious that othermean's mightbe em- 1 I claim as new, and desire to secure by Letters Patent, is-

1. The combination with the terminal of aconductor in the main-line circuit through the freceiver of a telephone; of a movable switchpiece arranged to make contact with such terminal and thereby close the circuit through conductor inthe main-line circuit through the receiver of a telephone, of a movable switchpiece arranged to" make contact with such a terminal and thereby close the circuit through the receiver; a spring holding said switch- }pieceorit of such contact; a' vertical sliding irodconnected with said swltch-piecepand an arm swiveled on saidrod and forming a rest for the elbow of the operator while u'sing the telephone.

3. The combination 'with the terminal of a conductor in the main line circuit through the receiver of a telephone; ot" a movable switchpiece arranged to' make contact with such terminal andthereby close the circuit through x'the receiver; a spring holding said switchpiece out of such contact; and a verticallymovable elbow-rest co'nnected with said movable switch-pieceand arranged tobe turned to lieagainst thebox whennot in'use.

the presence of two witnesses;

AUGUSTUS G: DAVIS. W'it'nesses:

F. PARKER DAVIS, JNo. T. MADDOX.

In-testimony whereof I aiiix lily-signature in v 

